Pluto, a dwarf planet 5.7 billion kilometers from the Sun, is an icy world with mountains, glaciers, and craters, averaging –232°C. It has five moons: Styx, Nix, Kerberos, Hydra, and Charon, the largest. Pluto and Charon form a “binary system,” orbiting a point between them. Recent research led by Silvia Protopapa found carbon dioxide and hydrogen peroxide on Charon’s surface using NASA’s James Webb Space Telescope, offering clues about their formation. Discovered in 1978, Charon is about half Pluto’s size and one-eighth its mass, making it the largest satellite relative to its parent body in our Solar System.